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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babb4a580c4753e456dd3b605bc31f574525528bb515d08a3511f159a2b121ca' 
  AND token = 'oGdzkfQKESvBQPLZCxxJU11HcgqSm18Mvdzhei3cJuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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