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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8748b174fe3d1a7a940da5b08954738b2862c252b968185b9f6b4afc6dcb1cf3' 
  AND token = 'w5RTB0EfWax5Fk59wK7mlltzlabZrZcWM77f3OclwAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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