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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fe00bd3b897738c24717287e70a898bf142e8715c423eca37172d6dd3d0056' 
  AND token = '8C4rsjucPVYqJMfOtybv4Rsk5uNNGbAMYtrUi/a+mPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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