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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c6204e510f6af1d62e3a39c686cbae516d091a8a72c975bfb02b13bc168ef5' 
  AND token = 'c4faz3flAy+mrl6llfkaEYgJBlZ2xjVuSYqoP8dQzEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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