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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7b2e947613349b5ae751e65db08ef1b3a1b4db0ff04d36a3e4a712af564b2c' 
  AND token = 'dH+x+OKzkqXRHpUHu0i3eSzMv2UDd5ecHRvvkra+xvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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