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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ed6a29ce66261dd1ce91d14218a987f6e048e3645274390d44ffdc39e5e852' 
  AND token = '7fkgxfu4yr1pCWZ0HQLCaT9u5MpELSAqVEMCFKBN8A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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