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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7c60ff47d620938b7ff519c8b2ec7d5834221dc1d32baa4f14b6c2f90eeccb' 
  AND token = 'nXOM/CCND8W6X8BzA9dLOO/2jvOyOJ6WcYJL5wg2Ht0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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