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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d12de2d23fb471f4448b64c820e0fab8a90ae9eab20a64c464eda39ecfe97c6' 
  AND token = 'KQPwYFJc3qeHNkBdDWQBs8C5g7iQaVgMyHAFXbC829w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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