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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965f84197dfaf760e80ea4c02e02685e1195e802c0509b9883a71ad8e4875ede' 
  AND token = 'Jva1SOEuFvnX+K7BYqBidfJyH+lr+NBnlT4mwa2VK3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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