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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d766d17253bca61dceb40b077c7b5f4f4db66fcc06d62ad1f6f287ffb878ec3' 
  AND token = 'CNu+ESPZicqmbrQRhsrY3Cgrsa80GX4FVASmfy18Tq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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