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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6a7a7522be2df51ced4ba4046325f5351d2032883afca7f79acb42689bf000' 
  AND token = '9igNOOaY3rW/4LYkOWDgs1fD3gmntW2D7Yz+jOqSE5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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