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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc860edc8df0f24535e7e04ebca32fa6915f5645fd505988fb8aaafce720c144' 
  AND token = 'n7hcL6RcYDf2E2top5eUnrDqu7268ZuQvM52qYOfE0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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