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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e12231bcb533ecb6a33c89946b56d789fdc87424999c1403fe081043900800d' 
  AND token = 'mndiYL0zpMLisIHVQHgenVRpPDSs7I0OJRo3uvK+ie0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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