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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2c5eabbba1e44e914e912707b012512901a16d9b984e413863d30d8f717149' 
  AND token = 'OZGhvHBwhhpOiOJ/et80B9yKIpsypbLOg5Eb9xz5G7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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