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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35ccb071ec7f7936dde5d0f41b42c688596fb41d266e3534c96aa94a7c26c0b' 
  AND token = 'SMDjea2IPkU1J6SsNi16A28akrIeX3PfzcfKYA57Yz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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