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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd55147764c14a0c2dc9d8bc1a29b8238faea7fa3b7826adc7660283a55cfa95' 
  AND token = 'yIUT7I1PursB/ezQixy0VnAtk5Dje1CX3lOr6KjRSkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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