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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a2cef740c366c0537b6b55746aadc959cff7f6c8a1fd4a16a892289a4bca55' 
  AND token = '/wZS9HS89yuc/BHg0wkaVl/uVrA6gZm/fDa7YNxMF0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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