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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc690a639dc8d2551dab1706743cce1c120e788013598e3c0610b41d69b9617' 
  AND token = 'y046KRtxWmXDOPX5EALKmpIZbAFg7hq/4+OLm6s6SYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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