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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd891568166ce41f7b17ea21c8f85cf659f8be2165bafd699a315305d72e8bff' 
  AND token = 's5yFL2/bjHbn5pHxk5R+t8QwhExIwtFxGBXCmvBlXu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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