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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a44d72689784f6e29af5dd5a2a77b4f24cd0f6c6d72386a75590dbc7d4c88dc' 
  AND token = 'rhGy+IYayoD7AgtTsT9Pd5Kg9LVNbvxZ/6EhkL5xKGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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