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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd631853e6e9a0a7dec169c51686ddf4818c9544ff3a2432254c1712537546ab' 
  AND token = '9mkQA4rfkNYMROxAAPikVpjqBONa0l42NdQlq53vM38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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