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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cd818b87a5abb6639d91990d97cb8ae6c803125c6c8fa77eedca55e200d071' 
  AND token = '9BvvONjh6J4vnMxdDzVeWU0zpzbEeF+/RRlfSGQQzgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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