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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396a86f0ce9764b39c370488d82e0d8429bd0b057997d7336db77839553818ca' 
  AND token = 'OVHARbBDvamskW/Nmk53ec/w718zOt24qNCvYYS9ZcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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