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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebcf3c8871e47c48beba1fcc8f19884b85517d9bbfe9eb73b60188afdd022f8' 
  AND token = '4cLn13aSav/yEk6Qcvj1uZ+phsx4gDDDXWB8O/Nyq9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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