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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3d835ab634f92bafe88818e2779286bc6a2849b02c4a233994392ba113bfae' 
  AND token = 'upL2S6v0X395nrTFdr8DDVbjTfiXIGcBO5sKZmMgmRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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