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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f0767f60baed612d00624b731b2940717a3184e02889638869087e33e68b62' 
  AND token = '0Ye7i/YEgQF8u7gj3sqYAq2/4LYOqndL4OQ1BGt8N38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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