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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33630ac19fbedcbf3e3963dda2a38a57a4c52971f54df0e5edca724dfae6caec' 
  AND token = '22OvIu1MG6aJD8Xh/Aif27BJYjta6dhcDmBZf+sJuIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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