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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fe5029c08d114f32af728fb59dc4e91428a3426edaea3b98d742f49eccbfda' 
  AND token = '3SM8TkEuXZ+k0Hkv1FigpSepE9LvakBvt0fZoJQZ3PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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