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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34516d3b18f6914327dc7474e916df4c22d48f15d79fcd809b3b89c169e584e8' 
  AND token = 'YIPeOc8ZoLXk42EvuXIe38Svcp/ifR7tacaIRrVWePY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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