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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02b2d1b29ffedb287c5649c7445f95d6a9fab4e008124a5fb9059ca679496c1' 
  AND token = 'r2wwZvBcyhR3QE3k8kq79DbkCdFEau0dRP3NOnLOh1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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