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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cfc6ba42c065740731b2c6296a2f7b88d477c1550ea2c53b7c721798dbd0f9' 
  AND token = 'CLENzfAZ8pDfBUx/KiSxrdfFrO9qTSLj20rroFVwqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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