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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9168233420217b5b48ee8eae591e36535abd9d6c13e85b96a3f55eb07e4d4317' 
  AND token = '9a/6mmiPa9QSWYYv2l0eeVZ8nzLeEY6WbiDVW+3ZPD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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