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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076f05dc0e9f3e9bde4a226c448833be97a30cb0441ee053429487a5b331065a' 
  AND token = 'on6EVAgZA9di+r5Pe1Q90NBNFl1MSWTjfpoS31T3Uh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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