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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bef70fc81662e2175df1a48ba8c8382b85678dafb27ef4c6e099285741b841c' 
  AND token = 'qnB2fj3GlLgWM15s/8ihg3bBWGxHXqYANcu2C7f0mCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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