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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf37ceb6994eae42ea9d1e7e33abd4fa7cb74575bb30cf8250f4e5d2e36edf80' 
  AND token = 'k9rAKEwWeDzVG8JAnYRLL3/Q3ky6N8dh3BASY4z0RO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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