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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5483b50f5403efb5fe44214aae03dece62ce242962237c8a90362dc45f414043' 
  AND token = 'm8AuO4afEOsZuZEVeSU4S8+847g5j3g3Dig33ZYB9CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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