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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48bd1a9c140105280f1d8dedede9f3febae15a54fb93a19442ea096df8306c6' 
  AND token = 'XcyMhlcfXnen2Cx9/ZIk/cRMdPCu8dEeI4Kb5740wWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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