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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44e41d9782e56f8ee8f4ef1e947abf7c8f2b0a17e820123ed2216ee2f320b86' 
  AND token = 'QjJ5c5q9eCO1jjP47Kzucera+m2rw2G70rtmAARjCnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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