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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62d16b9c11026608919d544d4ba57d7b092b883536858a8fce5ba3638b24b99' 
  AND token = 'KAuUhX+48m5J0f1UoIzFdt3xt1zUxUtZwXSkGvmtFKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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