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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aceed4a9bf66244e99ba28b3738eaaea9c715bf40b09c14158ca4ab48d95f6be' 
  AND token = 'p9/wyecF3UivT6Sp5wg3e+3EPRguU7ije6lINfsYgC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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