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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129e8e0c6aca4e9001ffddbdad3e015adcf8d5c1287c8a5c87caedbde2017389' 
  AND token = 'meJKa+yKMhKxYvUMy5BWlp6Ogp1dPol8smcm2/WZUK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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