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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0883016c83614802f1f3606c4718bf81ab5004bcff3593be9867a82fa093103' 
  AND token = 'NiOxBMj2rK2slMwXy1/O8IONyls3LHt/BXyGltXv8tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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