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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef2fcdb335e1bb5540dfd119e1dd74907c1e97700053833cbc6ee75920b42bb' 
  AND token = '05o6oqnjb5crhom5LC4CX5tHkl6MTpaac7mhZHf1L0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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