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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40077da74cf0b1a0586a3062875821a3728d97322eb9d787af692843b615d70' 
  AND token = 'XSLhF6u2jD0K7BDwQzoHqksHuNUzQrFpMDqG/bq4Ea0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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