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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0126f52bbbca3b4967e00c942644ccb8e3e288a86e9a8d2f2bbc20a6e07dd36a' 
  AND token = 'HHfdZRwCGUD3HK7Qci9yeI4ss0E9OapYS4WvO716mkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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