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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238f252c3ec9f2a3e5af3a9ddcb4b4ec62c56e31a1611f883093aca3998e06a5' 
  AND token = 'e/Z84XhnyJLp0ERCxf4yNHqIO8JgkMgwVmqheM9y11E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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