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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2eefd92342020e3fed572c56899848b4435498571544f0b5ba092bce9b1c91d' 
  AND token = 'bDuprI5O4Ru37tB14bLFRUx1QTrSPGzHWffGDO2v/3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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