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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810f7befb57693d6d469de127d335405c42e9cfacddf41e22ab61682b32c6322' 
  AND token = 'OnrKr47c/uVxeqQDKS5pnioXV8N+1wn7d77TDRZRiFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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