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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46a6bca8f829868c0e3a9ca82d88c0e6f18bceb0d3d4d314c052cd19170715e' 
  AND token = 'jt7syyFa3wwe1jt7pn6k8CRRxs/ReFR1GqOcJW1lu+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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