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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0652eebaa9f00a14afa7e3d7526dc68be5b6f3532e3a98689b47c4ce47a7751' 
  AND token = 'nLhXEbMhNRPmXsF83U9M/J6qhHGn3dTHR/7y/huqWKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}