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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a2b62c486c5bb0e3bbb773fd7a6b8d246b445a69e2ebe27ef8099967addbc5' 
  AND token = 'fpqp4pLBkRmPPpCV8msmJDhiq4uRefGUhHh9frYk+4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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