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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c08c9645bc9b68c32b2aa339feaab98ece30f72b82154405f6beb0ee088b830' 
  AND token = 'Wuu7zcsf7q0wylBtiavQ7LJ/zmvQJqhIt7UaHv7F/pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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