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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0862b0d2bfdb4ec3e811cb9985b340057477a43ba994da3ef1629e324251f0cb' 
  AND token = '12qPWEdboh0/UYHdAeHR6IJW3IcDboJIhl6e4dXMDMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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