SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7402c831e44f0e237754246dfb2107694471dc69202584e62811ac51736664f2' 
  AND token = 'KsZBRReHPGlhJOzfqmgOgwP0tKS0Hwd7uqa2Yf7KlCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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